Purpose

This report provides information about the tuning of the NARC mountaintop station HF antennas as of 2020-10-26.

Summary

  • The 160m dipole on the 80’ North tower is no longer resonant on the band.
    • We suspect corrosion in a connector at the base of the tower.
  • The 40m dipole on the 60’ West Tower is down and needs to be put back up again.

Recommendations

  • A work day should be scheduled soon to diagnose problems with the antennas and determine what repairs we can make on our own vs. those that require assistance.
  • The mountaintop management team (K3ROG, N3LI, W3EDP) should develop a regular antenna testing and reporting regime.

Tower-by-tower

60’ West Tower

Antennas

60’ West Tower

80’ Middle Tower

Antennas

80’ Middle Tower

  • VHF 4 element vertical orientation Yagi + rotator
  • 2 VHF fixed direction vertical orientation 6 element Yagis (W3YA system)
  • VHF vertical
  • 40m dipole oriented NW/SE

80’ North Tower

Antennas

80’ North Tower

  • 4 element Mosely CL-33-M-WARC triband (10, 15, 20m + WARC) Yagi
    • Fell during late winter 2020
    • Disassembled
    • Need to identify and order new parts
  • 160m dipole oriented NW/SE
  • 80m dipole

60’ East Tower

Antennas

60’ East Tower

  • VHF vertical
  • 80m dipole oriented N/S

Antenna plan

We developed and implemented an antenna plan in 2010.

Antenna plan 2010-04-12

Antenna plan 2010-04-12